I'm resurrecting this post, as I'm having a similar issue. I recently acquired a cart with LSDJ v5.9.1 and upon inserting it into my Gameboy Color, I saw the message "Cartridge test Testing save RAM Please wait... fail! Try cleaning pins or replace battery. Sorry!" (screenshots of Gameboy and cart below).
I've tried the following:
— followed the link to How To: Completely Erase the ROM of an EMS 64m USB Gameboy Cart, but it doesn't seem like my cart is an EMS 64m nor do I have a cart reader. So this doesn't seem like a solution, right?
— I cleaned the cart and Gameboy pins with 91% isopropyl alcohol.
— As suggested in the LSDJ manual "Try removing and re-inserting your cartridge about thirty, forty times.", also to no avail.
Is there a way to check the battery to see if it's truly dead? If it isn't dead can I use any old 3V coin cell as a replacement?
Any tips or guidance on bringing this cart to working order would be much appreciated.
Here's photo of the actual screen.
This is the front of the cart
Here's the back of the cart
